Autogen: Evaluate INTERFACE_AUTOMOC_MACRO_NAMES efficiently

In commit c5c3aff1f5 (Autogen: Add INTERFACE_AUTOMOC_MACRO_NAMES target
property, 2023-04-03, v3.27.0-rc1~197^2) we forgot to mark the property
as a usage requirement.  This is needed for efficient evaluation over
the target dependency closure.

Fixes: #25238